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Abstract:

A projector includes: a display section that displays an image on a
screen; a communicating section that communicates with an indicator that
indicates a position on the screen; an acquiring section that acquires
output destination information for specifying an output destination
retained in the indicator through the communicating section; and an
output control section that performs a control for outputting the image
information to an output destination specified by the acquired output
destination information.

Claims:

1. A display device comprising: a display section that displays an image
on a display surface; a communicating section that communicates with an
indicator that indicates a position on the display surface; an acquiring
section that acquires output destination information for specifying an
output destination retained in the indicator through the communicating
section; and an output control section that performs a control for
outputting the image information to an output destination specified by
the acquired output destination information.

2. The display device according to claim 1, further comprising: a
position detecting section that detects a position on the display surface
indicated by the indicator; and a process executing section that executes
a process based on the detected position.

3. The display device according to claim 2, wherein the process executing
section displays an image indicating a locus of the indicator on the
display surface based on the detected position, and wherein the output
control section outputs the image information including the image
indicating the locus.

4. The display device according to claim 1, further comprising: a setting
section that sets the output destination information to the indicator,
through the communicating section.

5. The display device according to claim 1, wherein the output
destination information includes identification information for
identifying the output destination, wherein the display device further
comprises: a storage unit that stores a correspondence relationship
between the identification information and the output destination, and
wherein the output control section outputs the image information to the
output destination which is in the correspondence relationship with the
acquired identification information.

6. A display method in a display device that communicates with an
indicator that indicates a position on a display surface on which an
image is displayed by a display section, the method comprising: acquiring
output destination information for specifying an output destination
retained in the indicator; and performing a control for outputting the
image information to an output destination specified by the acquired
output destination information.

7. A display system comprising: a display device; and an indicator,
wherein the display device includes a display section that displays an
image on a display surface, a communicating section that communicates
with the indicator, an acquiring section that acquires output destination
information for specifying an output destination retained in the
indicator through the communicating section, and an output control
section that performs a control for outputting the image information to
an output destination specified by the acquired output destination
information, and wherein the indicates includes a transmitting section
that transmits the output destination information to the display device.

Description:

[0003] The present invention relates to output of image information
indicating an image to be displayed by a display device such as a
projector.

[0004] 2. Related Art

[0005] In a product called an interactive white board, a handwriting image
of a user can be drawn using a pen type device, for example, to overlap
with an image displayed on a display surface by a display device such as
a projector. JP-A-2013-235416 discloses a technique that grants the
authority for a process relating to a handwriting image to a device used
by a user, and performs processes of storage, printing, deletion or
encryption of the handwriting image according to the authority.

[0006] In the interactive white board, in many cases, data output
functions for performing printing, storage, transmission, or the like of
a handwriting image of a user are provided. However, an operation
relating to setting of the output functions may be complicated for some
users. For example, in the case of printing, a user should perform an
operation of selecting a printer to be used for printing from plural
usable printers. In the case of storage, a user should perform an
operation of selecting any one of plural storage destinations such as a
portable storage medium such as a universal serial bus (USB) memory or an
SD card, and a server device on a network. When transmitting data using
electronic mail, a user should perform an operation of selecting a mail
address of a transmission destination from a list in which plural mail
addresses are registered. For example, when a participant should promptly
leave a conference room after a conference using an interactive white
board, it is difficult to perform a specific setting relating to data
output functions at the site.

SUMMARY

[0007] An advantage of some aspects of the invention is to provide a
display device capable of simply performing setting for output of image
information indicating an image to be displayed on a display surface to
an output destination desired by a user in a short period of time
compared with the related art.

[0008] A display device according to an aspect of the invention includes a
display section that displays an image on a display surface; a
communicating section that communicates with an indicator that indicates
a position on the display surface; an acquiring section that acquires
output destination information for specifying an output destination
retained in the indicator through the communicating section; and an
output control section that performs a control for outputting the image
information to an output destination specified by the acquired output
destination information.

[0009] According to this aspect of the invention, since the image
information is output to the output destination specified by the output
destination information retained in the indicator, it is possible to
simply perform setting for output of image information indicating an
image to be displayed on the display surface to an output destination
desired by a user in a short period of time compared with the related
art.

[0010] In the aspect of the invention, the display device may further
include: a position detecting section that detects a position on the
display surface indicated by the indicator; and a process executing
section that executes a process based on the detected position.

[0011] According to the aspect of the invention with this configuration,
it is possible to perform a process based on the position on the display
surface indicated by the indicator.

[0012] In the aspect of the invention, the process executing section may
display an image indicating a locus of the indicator on the display
surface based on the detected position, and the output control section
may output the image information including the image indicating the
locus.

[0013] According to the aspect of the invention with this configuration,
it is possible to simply output image information including an image
drawn using the indicator to an output destination desired by a user in a
short period of time compared with the related art.

[0014] In the aspect of the invention, the display device may further
include: a setting section that sets the output destination information
to the indicator, through the communicating section.

[0015] According to the aspect of the invention with this configuration,
it is possible to set output destination information for the indicator
using the function of the display device.

[0016] In the aspect of the invention, the output destination information
may include identification information for identifying the output
destination, and the display device may further include: a storage
section that stores a correspondence relationship between the
identification information and the output destination, and the output
control section may output the image information to the output
destination which is in the correspondence relationship with the acquired
identification information.

[0017] According to the aspect of the invention with this configuration,
since the indicator may not retain information relating to setting of the
output destination, it is possible to reduce the amount of data to be
retained by the indicator.

[0018] The invention may be implemented as a display method and a display
system, in addition to the display device.

BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The invention will be described with reference to the accompanying
drawings, wherein like numbers reference like elements.

[0020] FIG. 1 is a diagram illustrating an overall configuration of a
display system according to a first embodiment of the invention.

[0021] FIG. 2 is a block diagram illustrating a hardware configuration of
a projector according to the first embodiment.

[0022] FIG. 3 is a diagram illustrating a configuration example of an
output setting table according to the first embodiment.

[0023] FIG. 4 is a block diagram illustrating a hardware configuration of
an indicator according to the first embodiment.

[0024] FIGS. 5A and 5B are diagrams illustrating a function of the
indicator according to the first embodiment.

[0025] FIG. 6 is a sequence diagram illustrating an operation of the
display system according to the first embodiment.

[0026] FIGS. 7A and 7B are diagrams illustrating a menu screen displayed
by the projector according to the first embodiment.

[0027] FIG. 8 is a diagram illustrating a configuration example of data
retained by an indicator according to a second embodiment of the
invention.

[0028] FIG. 9 is a diagram illustrating a configuration example of an
output setting table according to the second embodiment.

[0029] FIG. 10 is a sequence diagram illustrating an operation of a
display system according to the second embodiment.

[0030] FIG. 11 is a diagram illustrating a configuration example of data
retained by an indicator according to a third embodiment of the
invention.

[0031] FIG. 12 is a sequence diagram illustrating an operation of a
display system according to the third embodiment.

DESCRIPTION OF EXEMPLARY EMBODIMENTS

[0032] Hereinafter, embodiments of the invention will be described with
reference to the accompanying drawings.

First Embodiment

[0033] FIG. 1 is a diagram illustrating an overall configuration of a
display system 1 according to a first embodiment of the invention. As
shown in FIG. 1, the display system 1 includes a projector 10, an
indicator 20, a personal computer (PC) 30, network printers 50A and 50B,
a network server 60, an operation panel 70, and a USB printer 80.

[0034] The projector 10 is a wall hanging type short-focus projector, and
is a projection type display device that projects an image on a screen 40
provided a short distance away. The projector 10 projects color images
onto the screen 40 based on image signals corresponding to color
components of three primary colors of red (R), green (G), and blue (B),
for example. In the present embodiment, the screen 40 is a reflection
type screen, which is a projection surface (that is, display surface) on
which an image is projected by the projector 10. The projector 10
functions as an interactive white board, detects an operation performed
using the indicator 20 by a user U with respect to the screen 40, and
executes a process depending on the detected operation (for example,
drawing of a handwriting image or a process based on a selected menu).
The projector 10 is not limited to the wall hanging type short-focus
projector, and may be an on-desk installation type projector or a
suspension type projector, or may be a normal focus projector.

[0035] In the present embodiment, the indicator 20 is a pen type device
(operation device), and is an indicator for indicating a position on the
screen 40. The indicator 20 is used by the user U in order to perform an
operation of hand writing a character or a figure or an operation of
selecting a menu displayed on the screen 40. The indicator 20 is not
limited to the pen type, and may be an operation device of a different
shape such as a rod shape.

[0036] In FIG. 1, only one indicator 20 used by the user U is present, but
an indicator 20 used by another user may be present together.

[0037] The PC 30 is an information processing apparatus which is a signal
source (video source) of an image signal input to the projector 10. The
PC 30 is connected to the projector 10 through a wireless local area
network (LAN) (not shown) in the example shown in FIG. 1, but may be
connected to a network through a wired LAN or other communication lines.
Further, the PC 30 may be connected to the indicator 20 through a
predetermined cable.

[0038] Each of the network printers 50A and 50B is a printer (printing
device) connected to the projector 10 through a wireless LAN. If the
network printers 50A and 50B receive image information transmitted by the
projector 10, the network printers 50A and 50B print an image based on
the received image information.

[0039] The network server 60 is a server device connected to the projector
10 through a wireless LAN. If the network server 60 receives image
information transmitted by the projector 10, the network server 60 stores
the received image information. Further, the network server 60 is
connected to a network NW such as the Internet, and the projector 10 is
connected to the network NW through the network server 60. For example, a
mail server (not shown) for transmitting electronic mail by the projector
10 is connected to the network NW. The projector 10 and the network
printers 50A and 50B or the network server 60 may be connected to each
other through a wired LAN or other communication lines.

[0040] The operation panel 70 is an operation device for performing an
operation of the projector 10, and is connected to the projector 10
through a cable CV. The operation panel 70 includes an interface for
performing data input and output with an external device connected
thereto, in addition to an operator (for example, physical buttons) for
performing an operation of the projector 10. The operation panel 70
performs data input and output with an external storage medium 71 that is
detachably mounted in the host device, for example. In the present
embodiment, a USB memory 71A and an SD card 71B are used as the external
storage medium 71 (see FIG. 2). Further, the operation panel 70 performs
data input and output with the USB printer 80.

[0041] The USB printer 80 is a printer connected to the operation panel 70
through a USB cable. If the USB printer 80 receives image information
transmitted by the projector 10 through the operation panel 70, the USB
printer 80 prints an image based on the received image information. The
operation panel 70 may be provided integrally with a printer body.

[0043] The CPU 11 is a processor that reads a program stored in the ROM 12
or the storage unit 18 using the RAM 13 and executes the program to
control the respective units of the projector 10. The operation unit 14
is an operation means that includes operators (for example, physical
keys) for turning on or turning off a power source of the projector 10
and for performing various operations. The image processing unit 15
includes an image processing circuit such as an application specific
integrated circuit (ASIC), and is in charge of image processing performed
in the projector 10. The image processing unit 15 performs image
processing such as resize processing or trapezoid correction, for
example.

[0044] The projection unit 16 projects (displays) an image on the screen
40 based on image information after image processing in the image
processing unit 15. The projection unit 16 includes a light source 161, a
liquid crystal panel 162, an optical system 163, a light source control
section 164, a panel drive section 165, and an optical system drive 166.
The light source 161 is a solid light source that includes a light
emitting diode (LED) or a semiconductor diode, for example, and emits
light to the liquid crystal panel 162. The liquid crystal panel 162 is a
light transmission type liquid crystal panel, for example, and is a light
modulator that modules light incident from the light source 161. The
liquid crystal panel 162 is provided to match the respective colors of
the three primary colors of R, G, and B. The optical system 163 includes
a lens and a drive circuit for lens adjustment, for example, and
magnifies light (image light) modulated by the liquid crystal panel 162
to be projected on the screen 40. The light source control section 164
drives the light source 161 under the control of the CPU 11. The panel
drive section 165 drives the liquid crystal panel 162 based on an image
signal supplied from the CPU 11. The optical system drive section 166
drives the drive circuit of the optical system 163 under the control of
the CPU 11.

[0045] The camera unit 17 includes an image sensor (for example, a CMOS
sensor or a CCD sensor), and image-captures the screen 40 under the
control of the CPU 11. The CPU 11 identifies the indicator 20 based on
emission light of the indicator 20 image-captured by the camera unit 17,
or detects a position on the screen 40 indicated by the indicator 20.

[0046] The projector 10 may detect the indicated position based on
reflection light reflected by the indicator 20 by a method using a light
curtain or the like, instead of detection of the position indicated by
the indicator 20 using the camera unit 17. In this case, a user's finger
or the like may be used as the indicator 20.

[0047] The storage unit 18 includes a storage device such as an
electrically erasable and programmable ROM (EEPROM), and stores a program
to be executed by the CPU 11 and an output setting table 181.

[0048] The communication interface 19 communicates with an external device
connected thereto, and functions as a communication unit that performs
input and output (transmission and reception) of data with the external
device. The communication interface 19 performs data input and output
with each of the above-described indicator 20, the PC 30, the network
printers 50A and 50B, the network server 60, the operation panel 70, and
the USB printer 80. The communication interface 19 performs short-range
wireless communication or infrared data communication with the indicator
20 based on Bluetooth (registered trademark), for example, to thereby
perform data input and output with the indicator 20. The communication
interface 19 performs communication with each of the PC 30, the network
printers 50A and 50B, and the network server 60 through a wireless LAN,
to thereby perform data input and output with the respective devices. The
communication interface 19 performs communication with the operation
panel 70 and the USB printer 80 through a cable CV, to thereby perform
data input and output with the respective devices.

[0049] FIG. 3 is a diagram illustrating a configuration example of the
output setting table 181 stored in the storage unit 18.

[0050] As shown in FIG. 3, in the output setting table 181, respective
pieces of information of output means, a control code, and output setting
information are stored in association.

[0051] The output means refers to means used for output of image
information indicating an image to be projected onto the screen 40.
Specifically, the output means of the present embodiment includes
"printing", "storage", "e-mail sending", and the like. Here, "printing"
refers to means for outputting image information to an external printer
which is an output destination in order to print an image indicated by
the image information. "Storage" refers to means for outputting image
information to an external storage medium which is an output destination
in order to store the image information. "E-mail sending" refers to means
for outputting image information (electronic mail) to a network NW (mail
reception terminal) which is an output destination in order to transmit
the image information using electronic mail. The output means is not
limited to the above-described examples.

[0052] The control code refers to data indicated by any value of "0" to
"5", which is a decimal number, and is an example of output destination
information for specifying an output destination of image information.
The output setting information is associated with the control code on a
one-to-one basis, and represents setting content of the output
destination of the image information. In the example of FIG. 3, for ease
of illustration, names of the output destinations of the image
information are represented as the output setting information.

[0053] When the output means is "printing", the output setting information
includes information on an address (IP address) allocated to a printer
which is an output destination, a printer name, a color mode, sheet
selection, and the like. When the output means is "storage", the output
setting information includes information on an address (IP address)
allocated to a storage device which is an output destination, the
presence or absence of compression of a storage format (file format), and
the like. When the output means is "e-mail sending", the output setting
information includes information on an address (IP address) allocated to
a device (mail server) which is an output destination, a server name, a
port number, and the like, and an address of a transmission destination
of electronic mail.

[0054] In the output setting table 181 shown in FIG. 3, two control codes
and two types of output setting information are associated with each of
the output means of "printing", "storage", and "e-mail sending".

[0055] Here, functions realized by the CPU 11 executing a program will be
described. The CPU 11 realizes functions corresponding to an acquiring
section 111, an output control section 112, a position detecting section
113, a process executing section 114, and a setting section 115, as shown
in FIG. 2.

[0056] When output of image information indicating an image to be
displayed on the screen 40 is instructed using the indicator 20, the
acquiring section 111 acquires output destination information for
specifying an output destination stored in the indicator 20 through the
communication interface 19. In the present embodiment, the acquiring
section 111 acquires a control code as the output destination
information.

[0057] The output control section 112 performs a control for outputting
the image information to the output destination specified by the output
destination information (control code) acquired by the acquiring section
111. In the present embodiment, the output control section 112 acquires
output setting information associated with the acquired control code from
the output setting table 181, and outputs the image information using the
acquired output setting information.

[0058] The position detecting section 113 detects a position on the screen
40 indicated by the indicator 20 based on emission light of the indicator
20 image-captured by the camera unit 17.

[0059] The process executing section 114 executes a process based on the
position indicated by the indicator 20, detected by the position
detecting section 113. The process executing section 114 generates an
image indicating a locus of the indicator 20 (hereinafter, referred to as
a "locus image"), for example, and draws (displays) the locus image on
the screen 40. Further, if an operation of selecting a menu displayed on
the screen 40 using the indicator 20 is detected, the process executing
section 114 executes a process based on the selected menu.

[0060] The setting section 115 sets output destination information
(control code) with respect to the indicator 20 through the communication
interface 19. The setting section 115 sets output destination information
based on an operation of the operation panel 70 or data received from the
PC 30. The output destination information may be set in the indicator 20
by communication between the PC 30 and the indicator 20, and in this
case, the function of the setting section 115 may be omitted.

[0061] FIG. 4 is a block diagram illustrating a hardware configuration of
the indicator 20. As shown in FIG. 4, the indicator 20 includes a CPU 21,
a ROM 22, a RAM 23, an operation unit 24, a light emitting unit 25, a
communication interface 26, and a storage unit 27.

[0062] The CPU 21 is a processor that reads a program stored in the ROM 22
using the RAM 23 and executes the program to control the respective units
of the projector 10. The operation unit 24 is operation means that
includes operators (for example, physical keys) for performing various
operations. The light emitting unit 25 includes a light emitting diode
that emits infrared light, and is turned on or turned off under the
control of the CPU 21. The communication interface 26 is a communication
unit that performs communication (wireless communication) with the
projector 10 to perform data input and output with the projector 10. The
communication interface 26 receives a signal transmitted from the
projector 10 using infrared light, for example. Further, the
communication interface 26 may perform short-range wireless communication
based on Bluetooth with the indicator 20 to perform data input and output
with the indicator 20. The storage unit 27 stores (retains) a control
code 271 as output destination information for specifying an output
destination of image information.

[0063] FIGS. 5A and 5B are diagrams illustrating functions of the
operation unit 24. FIG. 5A is a diagram illustrating an appearance
configuration of the operation unit 24, and FIG. 5B is a diagram
illustrating a relationship between each operator of the operation unit
24 and the control code 271 to be used.

[0064] As shown in FIG. 5A, the operation unit 24 includes operators 24A,
24B, and 24C provided in a housing of the indicator 20. Each of the
operators 24A, 24B, and 24C is a seesaw switch (locker switch), and is
provided one to one corresponding to each of the output means in the
projector 10. The operator 24A corresponds to the "printing" as the
output means, and is an operator for setting a control code corresponding
to "printing" to "0" indicating that a USB printer is an output
destination or to "1" indicating that a network printer is an output
destination. The operator 24B corresponds to "storage" as the output
means, and is an operator for setting a control code corresponding to
"storage" to "2" indicating that a USB memory is an output destination or
to "3" indicating that a network server is an output destination. The
operator 24C corresponds to "e-mail sending" as the output means, and is
an operator for setting a control code corresponding to "e-mail sending"
to "4" indicating that an output destination of electronic mail is a
first output destination or to "5" indicating that an output destination
of electronic mail is a second output destination.

[0065] The CPU 21 reads the control codes depending on the states of the
operators 24A, 24B, and 24C from the storage unit 27, and transmits the
result to the projector 10 through the communication interface 26.

[0066] Each of the operators 24A, 24B, and 24C is not limited to the
seesaw switch, and another switch (operator) of a dial type or a toggle
switch type, a touch panel type, or the like may be employed.

[0067] FIG. 6 is a sequence diagram illustrating an operation of the
display system 1.

[0068] The CPU 11 of the projector 10 controls the projection unit 16
based on an image signal acquired from the PC 30 through the
communication interface 19, and displays a background image on the screen
40 (step S1). If a power source is turned on, the CPU 21 of the indicator
20 starts light emission using the light emitting unit 25 (step S2). The
CPU 21 controls the light emitting unit 25 to repeat light emission and
lighting off in a unique pattern with respect to the host device so that
the indicator 20 can be uniquely identified, for example.

[0069] If the emission light of the indicator 20 is image-captured by the
camera unit 17 (step S3), the CPU 11 analyzes the captured image to
detect the position of the indicator 20 indicating a point on the screen
40 (step S4). Here, the CPU 21 generates identification information for
identifying the indicator 20 and position information (coordinate
information) indicating the position indicated by the indicator 20 on the
screen 40.

[0070] Then, the CPU 11 generates locus image indicating a locus of the
positions on the screen 40 indicated by the indicator 20, and controls
the projection unit 16 to draw (display) the locus image so that the
locus image overlaps with the background image (step S5). The CPU 11
stores image information obtained by combining the background image and
the locus image in the storage unit 18.

[0071] Then, the CPU 11 determines whether or not output of image
information indicating an image to be displayed on the screen 40 is
instructed using the indicator 20 (step S6). If an operation of selecting
any one of an icon I1 corresponding to the output means "printing", an
icon 12 corresponding to the output means "storage", and an icon 13
corresponding to the output means "e-mail sending", which are displayed
on the screen 40, is detected, as shown in FIG. 7A, the CPU 11 determines
that the output means corresponding to the selected icon is used. If any
one of the icons I1 to I3 is selected, the CPU 11 displays a menu screen
M1 shown in FIG. 7B on the screen 40. As shown in FIG. 7B, the menu
screen M1 includes a message "Do you want to output to an output
destination registered in a pen?", a soft button B1 displayed as "YES",
and a soft button B2 displayed as "NO".

[0072] When the operation of selecting the icons I1 to I3 is not detected,
or when an operation of selecting the soft button B2 of the menu screen
M1 is not detected, the CPU 11 determines that the result is "NO" in step
S6, and returns to the process of step S1.

[0073] When an operation of selecting the soft button B1 of the menu
screen M1 is detected, the CPU 11 determines that the result is "YES" in
step S6, and proceeds to a process of step S7. Then, the CPU 11 requests
transmission of a control code from the indicator 20 through the
communication interface 19 (step S7). If the control code request is
acquired through the communication interface 26, the CPU 21 of the
indicator 20 transmits control codes depending on circumstances of the
operations of the operators 24A, 24B, and 24C among the control codes 271
stored in the storage unit 27 to the projector 10 in response to the
request (step S8). When the operators 24A, 24B, and 24C are in the states
shown in FIG. 5A, the CPU 21 transmits "0", "3", and "4" as the control
codes.

[0074] Since the amount of information of the control codes is relatively
small, the CPU 21 transmits the control codes through infrared
communication, for example. Further, if information on the output means
to be used is included in the request transmitted in step S7, the
indicator 20 may transmit a control code corresponding to the output
means.

[0075] The CPU 11 of the projector 10 acquires the control code from the
indicator 20 through the communication interface (step S9). Then, the CPU
11 acquires output setting information associated with the acquired
control code from the output setting table 181 (step S10). Here, the CPU
11 acquires output setting information associated with output means
determined to be used. For example, when "printing" is used as the output
means, the CPU 11 acquires output setting information on the USB printer
80 associated with the control code "0". When "storage" is used as the
output means, the CPU 11 acquires output setting information on the
network server 60 associated with the control code "3". When "e-mail
sending" is used as the output means, the CPU 11 acquires output setting
information on a mail reception terminal MA associated with the control
code "4".

[0076] Then, the CPU 11 outputs image information indicating the image to
be displayed on the screen 40 using the output setting information
acquired in step S10 (step S11). The CPU 11 reads image information
indicating all screens displayed during a conference or all screens
including a locus image, for example, in addition to image information
indicating a screen which is currently displayed, from the storage unit
18 for transmission.

[0077] In step S11, when "printing" is used as the output means, the CPU
11 transmits (outputs) the image information to the USB printer 80
through the communication interface 19, and causes the USB printer 80 to
print an image indicated by the image information. When "storage" is used
as the output means, the CPU 11 transmits (outputs) the image information
to the network server 60 through the communication interface 19, and
stores the image information. When "e-mail sending" is used as the output
means, the CPU 11 transmits (outputs) an e-mail to which the image
information is attached to the network NW (mail server) through the
communication interface 19 in order to transmit the image information to
the mail reception terminal MA.

[0078] According to the display system 1 of the above-described first
embodiment, the user U can select an image information output destination
by the operations of the operators 24A, 24B, and 24C of the indicator 20.
The projector 10 acquires the control codes depending on the states of
the operations of the operators 24A, 24B, and 24C from the indicator 20,
and performs a control for outputting image information using the output
setting information associated with the acquired control codes.
Accordingly, according to the display system 1, it is not necessary that
the user U operates a menu displayed on the screen 40 whenever image
information is output to perform setting of an output destination.
Accordingly, the user U can simply perform setting for output of image
information to a desired output destination in a short period of time
compared with the related art.

Second Embodiment

[0079] In the first embodiment, the output destination is selected
according to the state of the operation of the operation unit 24 of the
indicator 20, but in the second embodiment, an output destination is
selected by data stored in the storage unit 27 of the indicator 20. In
the present embodiment, components with the same reference numerals as in
the first embodiment have the same functions as in the first embodiment,
and components with "A" at the end of the reference numerals realize
functions corresponding to the respective components described in the
first embodiment.

[0080] FIG. 8 is a diagram illustrating a configuration example of a
control code 271A stored in the storage unit 27. As shown in FIG. 8, the
control code 271A is configured by 16-bit (2 byte) information.
High-order 8 bits (1 byte) among the control code 271A represent
information for specifying a display attribute of a locus image, which is
referred to as "control code A". The display attribute refers to
information for designating an attribute of display of the locus image,
which designates a mode of display of the locus image. High-order 4 bits
among the control code A correspond to the color of the locus image,
middle-order 2 bits correspond to the shape of the locus image, and
low-order 2 bits correspond to the thickness of the locus image.
Low-order 8 bits (1 byte) among the control code 271A represent
information for specifying an output destination of image information,
which is referred to as "control code B". High-order 4 bits among the
control code B are used to identify an output destination in the output
means "e-mail sending", middle-order 2 bits are used to identify an
output destination in the output means "storage", and low-order 2 bits
are used to identify an output destination in the output means
"printing".

[0081] The control code 271A is set in advance based on an operation of
the operation panel 70 or data received from the PC 30. In the present
embodiment, the control code 271A may be set in the indicator 20 by
communication between the PC 30 and the indicator 20.

[0082] FIG. 9 is a diagram illustrating a configuration example of an
output setting table 181A stored in the storage unit 18.

[0083] As shown in FIG. 9, information indicating a correspondence
relationship between the control code A and display attribute information
indicating a display attribute of a locus image, and information
indicating a correspondence relationship between the control code B and
output setting information is stored in the output setting table 181A. In
the first embodiment, two output destinations are designated per output
means, but in the present embodiment, a large number of output
destinations may be designated by a number according to the number of
bits of the control code B, compared with the first embodiment. For
example, since an output destination of an electronic mail is identified
by 4-bit information in the present embodiment, any one of total 16
transmission destinations of mail reception terminals MA to MP is
selected. Further, in the present embodiment, since the display attribute
is designated by the control code A, it is possible to draw the locus
image using a display attribute according to a user who uses the
indicator 20.

[0084] FIG. 10 is a sequence diagram illustrating an operation of the
display system 1.

[0085] The CPU 11 of the projector 10 controls the projection unit 16
based on an image signal acquired from the PC 30 through the
communication interface 19, and displays a background image on the screen
40 (step S1). If the power source is turned on, the CPU 21 of the
indicator 20 starts light emission using the light emitting unit 25 (step
S2). Then, if the emission light of the indicator 20 is imaged (captured)
by the camera unit 17 (step S3), the CPU 11 analyzes the captured image
to detect the position of the indicator indicating a point on the screen
40 (step S4).

[0086] Then, the CPU 21 of the indicator 20 transmits the control code A
stored in the storage unit 27 to the projector 10 through the
communication interface 26 (step S21). If the control code A transmitted
in step S21 is acquired through the communication interface 19 (step
S22), the CPU 11 acquires display attribute information associated with
the acquired control code A from the output setting table 181A, and sets
the acquired display attribute information (step S23). Further, the CPU
11 generates a locus image indicating a locus of the positions on the
screen 40 indicated by the indicator 20, and controls the projection unit
16 to draw (display) the generated image so that the locus image overlaps
with the background image (step S5A). Here, the CPU 11 generates the
locus image according to the display attribute represented by the display
attribute information acquired in step S23.

[0087] Then, the CPU 11 determines whether output of image information
indicating an image to be displayed on the screen 40 is instructed using
the indicator 20 (step S6). When the determination result in step S6 is
"YES", the CPU 11 requests transmission of the control code B from the
indicator 20 through the communication interface 19 (step S7A). If the
request is acquired through the communication interface 26, the CPU 21 of
the indicator 20 transmits the control code B to the projector 10 in
response to the request (step S8A).

[0088] The CPU 11 of the projector 10 acquires the control code B from the
indicator 20 through the communication interface 19 (step S9A). Then, the
CPU 11 acquires output setting information associated with the acquired
control code B from an output setting table 181A (step S10A). Here, the
CPU 11 acquires the output setting information corresponding to output
means to be used. Further, the CPU 11 outputs the image information
indicating the image to be displayed on the screen 40 using the output
setting information acquired in step S10A (step S11A).

[0089] For example, when high-order 4 bits of the control code B are
"1111", and when "e-mail sending" is used as the output means, the CPU 11
transmits (outputs) the image information using a mail address of a mail
reception terminal MP acquired from the output setting table 181A. When
middle-order 2 bits of the control code B are "01", and when "storage" is
used as the output means, the CPU 11 outputs the image information to the
USB memory 71 using output setting information acquired from the output
setting table 181A. When low-order 2 bits of the control code B are "01",
and when "printing" is used as the output means, the CPU 11 transmits
(outputs) the image information to the USB printer 80 using output
setting information acquired from the output setting table 181A.

[0090] In the display system of the second embodiment, it is possible to
select an output destination of image information by the control code B
stored in the indicator 20. Accordingly, in the display system, similar
to the first embodiment, it is possible to simply perform setting for
output of image information to a desired output destination in a short
period of time compared with the related art. Further, according to the
display system of the present embodiment, since the display attribute of
the locus image is controlled by the control code A from the indicator
20, it is not necessary that the user U selects the display attribute of
the locus image again. Further, since the amount of information of the
control code 271A is relatively small, it is possible to suppress a
capacity increase of a storage region of the storage unit 27.

Third Embodiment

[0091] In the second embodiment, the control code 271A is stored in the
storage unit 27 of the indicator 20, and the projector 10 acquires output
setting information based on the control code 271A and the output setting
table 181A of the projector 10. Instead, setting information 271B
including output setting information may be retained by the indicator 20.
In the present embodiment, components with the same reference numerals as
in the second embodiment have functions equivalent to those of the second
embodiment, components with "B" at the end of the reference numerals
realize functions corresponding to the respective components described in
the second embodiment.

[0092] FIG. 11 is a diagram illustrating a configuration example of the
setting information 271B stored in the storage unit 27. As shown in FIG.
11, the setting information 271B includes display attribute information
and output setting information. The display attribute information has the
same configuration as that of the display attribute information stored in
the output setting table 181A of the second embodiment. The output
setting information has the same configuration as that of the output
setting information stored in the output setting table 181A of the second
embodiment, and in the present embodiment, a set of output setting
information is stored for each output means of image information.

[0093] The setting information 271B is set in advance based on an
operation of the operation panel 70 or data received from the PC 30. In
the present embodiment, similarly, the setting information 271B may be
set in the indicator 20 by communication between the PC 30 and the
indicator 20.

[0094] FIG. 12 is a sequence diagram illustrating an operation of the
display system 1.

[0095] The CPU 11 of the projector 10 controls the projection unit 16
based on an image signal acquired from the PC 30 through the
communication interface 19, and displays a background image on the screen
40 (step S1). If the power source is turned on, the CPU 21 of the
indicator 20 starts light emission using the light emitting unit 25 (step
S2). Then, if the emission light of the indicator 20 is imaged (captured)
by the camera unit 17 (step S3), the CPU 11 analyzes the captured image
to detect the position of the indicator indicating a point on the screen
40 (step S4).

[0096] Then, the CPU 21 of the indicator 20 transmits display attribute
information of the setting information 271B stored in the storage unit 27
to the projector 10 through the communication interface 26 (step S21B).
The CPU 11 acquires the display attribute information transmitted in step
S21B, and sets the acquired display attribute information (step S23B).
Further, the CPU 21 generates a locus image indicating a locus of the
positions on the screen 40 indicated by the indicator 20, and controls
the projection unit 16 to draw (display) locus image so that the locus
image overlaps with the background image (step S5B). Here, the CPU 11
generates a locus image according to the display attribute indicated by
the display attribute information acquired in step S23B.

[0097] Then, the CPU 11 determines whether or not output of image
information indicating an image to be displayed on the screen 40 is
instructed (step S6). When the determination result in step S6 is "YES",
the CPU 11 requests transmission of output setting information from the
indicator 20 through the communication interface 19 (step S7B). If the
output setting information request is acquired through the communication
interface 26, the CPU 21 of the indicator 20 transmits the output setting
information of the setting information 271B to the projector 10 in
response to the request (step S8B).

[0098] The CPU 11 of the projector 10 acquires the output setting
information from the indicator 20 through the communication interface 19
(step S10B), and outputs image information indicating the image displayed
on the screen 40 using the acquired output setting information (step
S11B).

[0099] For example, when "e-mail sending" is used as the output means, the
CPU 11 transmits (outputs) the image information using a mail address of
a mail reception terminal MA. When "storage" is used as the output means,
the CPU 11 transmits (outputs) the image information to the network
server 60. When "printing" is used as the output means, the CPU 11
transmits (outputs) the image information to the USB printer 80.

[0100] According to the display system of the above-described third
embodiment, similar to the second embodiment, it is possible to simply
perform setting for output of image information to a desired output
destination in a short period of time compared with the related art.
Further, since the output setting information is retained in the
indicator 20 in the display system of the present embodiment, the
projector 10 may not store the output setting table 181A. For example, in
the output means "e-mail sending", there is a possibility that a large
number of candidates of transmission destinations of an electronic mail
are present, but it is possible to transmit image information to a
desired transmission destination of the user U without setting a mail
address with respect to the projector 10.

Modification Examples

[0101] The invention may be realized in modes different from the
above-described embodiments. Further, each of the above-described
embodiments and each of the following modification examples may be
appropriately combined.

[0102] In the first embodiment, two output destinations are associated
with one means in the indicator 20, but three or more output destinations
may be selected with respect to one means. Further, in the first
embodiment, display attribute information may be set in advance by a
combination of the second embodiment or third embodiment.

[0103] In the second embodiment, the control code retained in the
indicator 20 may be identification information for uniquely identifying
the indicator 20. In this case, in the output setting table 181A, display
attribute information and output setting information are stored in
association with the identification information on the indicator 20.

[0104] In the above-described respective embodiments, when "e-mail
sending" is selected as the output means, and when a mail address of a
transmission destination is not set in advance, the projector 10 may
transmit image information using a predetermined mail address. Further,
an output destination when "storage" is used as the output means may be
the storage unit 27 of the indicator 20.

[0105] When plural output destinations are specified by output destination
information retained by the indicator 20, the CPU 21 displays a certain
destination to be used among the plural output destinations on the screen
40 as a predetermined menu screen, for example, so that the user U can
select the destination. In this case, since candidates of the output
destinations are narrowed down to some extent for each indicator 20, an
operation burden laid on the user is reduced.

[0106] A method for setting information to the indicator 20 is not
particularly limited. For example, the indicator 20 may read a coded
image formed of two-dimensional codes or the like, and may set output
destination information acquired from the coded image.

[0107] In the above-described embodiments, a front projection type
projector is employed as the display device, but the display device may
employ a rear projection type projector, a liquid crystal display, or the
like, for example. The light source 161 may employ a discharge lamp such
as a mercury lamp. The liquid crystal panel 162 may employ a reflection
type liquid crystal panel. Further, a micro-mirror array device, or the
like may be employed instead of the liquid crystal panel 162.

[0108] As a method for detecting the position of the indicator 20, a
method based on imaging (capturing) by means of the camera unit 17, a
method using a light curtain, or the like is used as described above, but
both of the methods may be used together. In this case, it is possible to
recognize an indicator that detects the position by emission light of a
pen or the like and an indicator that detects the position by reflection
light of a user's finger or the like, as separate indicators, and thus,
it is possible to allocate output setting based on the user's finger to a
specific output destination, for example. In other words, the position
detection based on the reflection light corresponds to acquisition of
output destination information for specifying an output destination
retained in the indicator.

[0109] In the above-described embodiments, the respective functions
realized by the CPU 11 of the projector 10 may be realized by combination
of plural programs, or may be realized by association of plural hardware
resources. Further, when the functions of the CPU 11 are realized by a
program, the program may be provided in a state of being stored in a
computer-readable recording medium such as a magnetic recording medium
(magnetic tape, magnetic disk (hard disk drive (HDD), flexible disk (FD),
or the like), an optical recording medium (optical disc or the like), a
magneto-optical recording medium, or a semiconductor memory, or may be
distributed through a network. Further, the invention may be understood
as a display method.